Category: Freshwater

Browse over 34,000 nationally-significant freshwater fish observations covering sample sites up and down New Zealand.

Explore this digital geospatial database of approximately 600,000 New Zealand river segments and related catchments.

Explore and access flows and water levels for selected rivers and streams in New Zealand.

View scientific observations of freshwater chemistry data across New Zealand, including dissolved oxygen, temperature, pH and conductivity - all quality assured by NIWA experts.

Get estimates of peak flood flows and understand the magnitude and frequency of floods across New Zealand.

Dive into LakeSPI (Lake Submerged Plant Indicators) - a lake information and management tool used to assess and report on the ecological condition of New Zealand lakes.

The New Zealand Drought Monitor is a system for keeping track of drought conditions across New Zealand based on a standardised climate index.

National daily river flow forecasts for 24-hour periods across New Zealand.

Groundwater Maps Explore thematic groundwater maps of New Zealand, including hydrogeological-unit and systems - all quality assured by GNS experts.

ESR monitors New Zealand’s wastewater for the presence of SARS-CoV-2 – the virus that causes COVID-19. Check the weekly wastewater surveillance report from sampling across the country.

A water quality restoration tool that can help reduce levels of sediment, nutrients and microbes. This can the water quality exiting the wetland and the ecology of downstream water bodies.

Includes about 500 aquatic invertebrate taxa. There's 16 broad trait categories that are divided into subcategories.

These calendars cover 41 key freshwater fish species and are designed to help people working near freshwater minimise the impact of their work on the fish. Includes spawning and migration periods.

Tau kōura is a traditional Māori fishing method commonly used to harvest kōura or freshwater crayfish in areas where they are abundant.